Oral appliance



FIG. 1 is a front perspective view of an oral appliance of the design;

FIG. 2 is a rear perspective view of the oral appliance as shown in FIG. 1 ;

FIG. 3 is a front view of the oral appliance as shown in FIG. 1 ;

FIG. 4 is a rear view of the oral appliance as shown in FIG. 1 ;

FIG. 5 is a left side view of the oral appliance as shown in FIG. 1 ;

FIG. 6 is a top plan view of the oral appliance as shown in FIG. 1 ; and,

FIG. 7 is a bottom plan view of the oral appliance shown in FIG. 1 .

The broken lines shown in the drawings are for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for an oral appliance, as shown and described. 